Screw-wrench



W. R. SHERMAN.

(No Modef.)

SCREW WRENCH.

Patented May 14., 1895.

jizz/6722157'.

UNITED STATES PATENT OFFICE.

WILLIAM RsHERMAN, on SECRETARY, MARYLAND.

SCREW-WRENCH.

SPECIFICATION forming part of Letters Patent No. 539,311, dated May 14,1895.

Application filed November 16, 1892. Serial No. 452,229. (No model.) I

The objects of my improvement are, first,

to provide jaws with V shaped grooves to grip the nut by the corners and thereby prevent it from slipping; second, to provide an adj u'stable part also with V shaped grooves to grlp the nut by the corners; also an adjustable diagonal part to grip the nut, each working independently of the other;` third, an adjustable clamp opening with a spring also.

with V shaped grooves to grip the nutbyjthe corners, the whole formed into an adjustable combination screw wrench with which a nut in any and all positions may be operated. I attain these objects by the mechanism illustrated by the accompanying drawings, in which- Figure l is a plan View of the entire instrument; Fig. 2, a side View of the sameas it appears after' the removal of 'theuspringvclamp; Fig. 3, a vertical elevation, partly in section, of the spring-clamp, which may be attached or not, as desired; Fig. 4, a side view of Fig. 3; Fig. 5, an end View of Fig. 3.

Similar letters refer to similar parts throughout the several views.

The screw wrench with the spring clamp removed is made with the usualthreaded bar B, standing jaw a, movable jaw a', and turning nut c. At the other end the bar Bis provided With a fixed head, having laterally extending jaws d d', having respectively a rectangular recess with angular notches, e, e, in its faces and an inclined face with longitudinal angular gripping recess f. Shown by dotted lines in Fig. .1. v, Combined with this are a pair of inner jaws correspondingly recessed and connected together so as to form a socket, through which the screw shank passes, and a nut c seated on said inner jawsand serving by engagement with the threaded bar B to move the inner jaw upon the shank ofthe outer jaw. I provide, also, a spring clamp having a rectangular recess k, at its closed end and at the other a pair of tapered spring arms Z, l, angularly notched at their extremities to engage the corners of a nut. The body ofthe clamp is longitudinally recessed at fml to engage the face of either of the jaws or the jaw shank.

To'connect the spring clamp to the screw wrench it is'necessary to open the jaws a, and a', by turning the nut o, sufciently to vpermit the insertion of the standing jaw c, between the springs of the clamp and the movable jaw a within the slotted end'of the spring clamp, the bar B being inserted laterally in the groove made for the purpose, thereby placing the slotted jaws of the spring lclamp in position toreach and operate a nut inside of a pipe or in other similar position. The spring clamp may alsootherwise be connected tothe screw wrench by placing the bar B in the jag made for the purpose located between the springs of the clamp, said spring clamp being at right angles'to the bar and placed between the jaws a and a', thereby producing a wrench with which a nut located -in a 'corner may be operated. As this arrangement is readily understood it has not been illustrated in the drawings. The spring clamp may also be applied to the other end of the wrench. In either case the spring clamp is firmly held in position between the jaws a and a of the wrench by turning the nu't c. The jaws of the spring clamp are adj usted by moving the ring D which surrounds them.

The spring clamp Yis easily attached to or.

ingiy recessed and connected togetheryso as laterally to engage the` jaws andishank of to form a socket through which the screw the primary wrench all substantially as set Io shank passes and a nut seated in slad imel;` forth. jaws and moving the inner upon t e s an T s of the Outer jaws WVM. R. SHERMAN 2. The combination of a primary wrench Witnesses: and a supplemental clamp consisting of a J. HARRY HOWARD, pair of spring jaws being slotted endwise and B. W. HOLLAND. 

